I just bought an MSI 6990 video card to replace my HD5770.
I've installed it, and it runs fine for the most part, however, the temps idle are around 53c and when I play a game (dragon age 2, RIFT, etc) the video card will shut off after a bit, but the comp stays on.

I have a 700 watt power supply, I beleive I have everything set up correctly but I don't know what else to do!

I was having problems with afterburner when trying to manually set the fan speed to 100%
Afterburner would always lower itself every time I selected apply.
I have mine in OC mode 880MHz 100% fan speed manually set in CCC
overdrive settings. Stays around 54C BFBC2 under load.